Detroit Lions head coach Jim Caldwell announced Sunday tight end Eric Ebron suffered an injury during practice, Tim Twentyman of the team's official website reported.
Caldwell wasn't sure of the nature of Ebron's injury but said it may have been his hamstring.
When healthy, Ebron has served as a safety blanket for quarterback Matthew Stafford.
Appearing in 13 games a season ago, Ebron hauled in a career-high 61 passes for 711 yards. However, he only hit paydirt once after recording five touchdowns in 2015.
"Every single year when you look at his output, he's improved.